Bertarelli, 48, is a Swiss/Italian pharmaceutical entrepreneur who inherited the biotech company Serono after his father’s death in 1998.

His net worth is $12.2 billion, according to Forbes. His wife, Kirsty Bertarelli, 42, was crowned Miss U.K. in 1988 and is one of Britain’s richest women, according to the Daily Mail.

VAVA II’s recent ports of call were Honolulu and Port Townsend, according to Marine Traffic, a website that tracks maritime vessels’ locations and travels.

The VAVA II went through the Ballard Locks Friday afternoon without any issues, a Locks official said, though onlookers said it did almost hit the side of the chamber a few times.

Though it dwarfs the sailboats and dinghies often seen on Lake Union, the VAVA II isn’t the largest yacht to dock in Seattle waters. That prize likely goes to The Serene, a $330 million yacht owned by Russian vodka distributor Yuri Scheffler, which was moored in Elliott Bay in August 2013. The Serene is about 124 feet longer than the VAVA II.

It’s unclear how long the VAVA II will be in Seattle.

The yacht has a fuel capacity of 115,043 gallons, which provides a maximum range of 5,000 nautical miles at 14 knots.

According to the Daily Mail, refueling costs the billionaires $400,000.